Keith Emery wrote: > When I enable spkmodem in the coreboot config, I get output from the PC > speaker. But spkmodem-recv interprets the tones as consistent gibberish. > The output is consistent with a mismatch in the baud rates, but there > appears no apparent way to select anything different in the > spkmodem-recv software.
spkmodem uses a fixed baudrate, IIRC 1200. Did you look at a recording in a spectrum analyzer software? Maybe that would help identify modulation timing issues. > If the CPU is running coreboot as fast as possible while receiving > those instructions from a relatively slow SPI bus. Is it possible > that I've somehow overclocked the SPI bus, leading to a mismatch in > the baud rates? SPI isn't involved in tone timing, I think only the (emulated) legacy timer is used for that. //Peter _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
